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213 104 104 2 2 William A. Corrigall Kathleen M. Coen Addiction Research Foundation 33 Russell Street M5S 2S1 Toronto Ontario Canada Department of Physiology, Faculty of Medicine University of Toronto M5S 2S1 Toronto Ontario Canada Abstract Rats were trained to self-administer cocaine in 1-h sessions on a fixed ratio 5 (FR5) schedule of reinforcement. Acquisition was carried out at a unit dose of 0.3 mg/kg and responding was then stabilized at cocaine doses of 0.1, 0.3, and 1.0 mg/kg/infusion. Pretreatments with naltrexone (0.1–10 mg/kg, SC) 20 min prior to the start of self-administration sessions resulted in decreases in cocaine self-administration at doses of 0.1 and 0.3 mg/kg/infusion, but not at 1.0 mg/kg/infusion. Decreases depended on the dose of naltrexone used, with greater decreases in self-administration occurring at higher antagonist doses. In addition, treatment with the opiate antagonist naloxone also reduced cocaine self-administration at a unit dose of 0.3 mg/kg. A group of rats trained to self-administer nicotine at a dose of 0.03 mg/kg/infusion on the same schedule of reinforcement was unaffected by naltrexone treatment. These results may indicate that an endogenous opiate system plays a role in cocaine reinforcement.
Psychopharmacology – Springer Journals
Published: Jun 1, 1991
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